Improved window-shade fixture



JARRZ RURNs, or NRW YORK, N. Y.

IMPROVED WINDOW-SHADE FIXTURE.

Specication forming part of Letters Patent No. 94,866, dated September14, 1869.

To all whom it may concern:

Be it known that I, JAREZ BURNs, of the l city, county, and State of NewYork, haveV invented a new and useful Improvement in Shade-Fixtures; andI do hereby declare the following to be a full, clear, and exactdescription thereof, which will enable those skilled in the art to makeand use thesame, reference being had to the accompanying drawing,forming part of this specication, in which drawing- Figure 1 representsa longitudinal section of. this invention. Fig. 2 is a transversesection of the same on a larger scale than the previous figure.

Similar letters indicate corresponding` parts. This invention consistsin the arrangement of one or more triangular wedge-shaped stops placedinto a cam-case which is attached to and revolves with 'a shade-roller,in combination with -a stationary bearing-pin provided with a square orpolygonal p art and secured to one end of a spring, the other end ofwhich is attached to the shade-roller in such a manner that when theshade or curtain is drawn down the spring is wound up, and ready tocarry the shade up again automatically, and

' if the shade is allowed to pass up slowly, the

triangular wedge drops down and forms a positive stop, whereby the shadeis retained in the desired position, but when the shade is allowed tofollow the action of its spring rapidly, the wedge has not time to dropdown and act as a stop, and the shade is rolled up and returned to itsoriginal position.

A represents the shade-roller, which is provided at one end with a roundgudgeon, a, on which the roller revolves. The opposite end of theshade-roller is bored out to receive the spring b, which is fastened atits inner end to the roller, and at its outer end to the pin o, which ismade with a square or polygonal part, d, to engage with the wedge shapedcams e, as will be presently explained, and which is also provided witha round bearing, f, and with a flat end, g.

The round bearing f tits into a plate, h, which is firmly secured to theend of the sh aderoller, and it forms the journal for the roller, whilethe flat end g of said pin engages with a slotted bracket, t', which isattached to the window frame or casing, so that, when the roller isrevolved in the proper direction, the pin will remain stationary and thespring b is wound up, and if the roller is released, it is carried backto its original position by the action of the sprin g.

The wedge-shaped cams e are placed loose ly into recesses kin thecam-case l, which is secured to the end of the roller A under the plateIt, and which is provided with a hole in its center, to allow the pin cto pass freely through it.

The shade B is rolled up on the roller A in suchv a direction that bypulling the shade down the spring B is wound up, and the cams e aretriangular, and placed in such a position into the cam-case that whenthe roller revolves in direction of arrow 1, Fig. 2, said cams do notobstruct its motion, but, if the roller is revolved in the direction ofarrow 2, the short sides of the cams turn down upon the iiat sides ofthe square or polygonal part ot the pin c, and prevent a further motionof the roller.

`It' the shade is pulled down, therefore, the cams will not act, but ifthe roller is allowed 'to follow the action of its spring e, and toreturn, the cams act as stops, provided the motion of the roller is slowenough to give said cams time to act. If the roller in its returnVmotion is allow to move rapidly, the cams are kept in the outer ends oftheir recesses by the centrifugal force, and they do not act as stops.

By this arrangement, the construction of the automatic shade-roller andstops is materially facilitated, the cams and cam-case can be easilycast, they require no fitting, the cams can be dropped into theirrecesses without loss of time, and they act directly against .actingagainst .the hat surfaces of the pin c,

which forms the journal for one end of the roller A, all combined andarranged as herein shown and described.

J ABEZ BURNS.

Witnesses W. HAUFF, ERNnsT F. KasTENHUBER,

